///////////////////////////////////////////////////////////////////////////////
//
//                          IMPORTANT NOTICE
//
// The following open source license statement does not apply to any
// entity in the Exception List published by FMSoft.
//
// For more information, please visit:
//
// https://www.fmsoft.cn/exception-list
//
//////////////////////////////////////////////////////////////////////////////
/*
 *   This file is part of MiniGUI, a mature cross-platform windowing
 *   and Graphics User Interface (GUI) support system for embedded systems
 *   and smart IoT devices.
 *
 *   Copyright (C) 2002~2018, Beijing FMSoft Technologies Co., Ltd.
 *   Copyright (C) 1998~2002, WEI Yongming
 *
 *   This program is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation, either version 3 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 *   Or,
 *
 *   As this program is a library, any link to this program must follow
 *   GNU General Public License version 3 (GPLv3). If you cannot accept
 *   GPLv3, you need to be licensed from FMSoft.
 *
 *   If you have got a commercial license of this program, please use it
 *   under the terms and conditions of the commercial license.
 *
 *   For more information about the commercial license, please refer to
 *   <http://www.minigui.com/blog/minigui-licensing-policy/>.
 */
/*
** ads.c: Low Level Input Engine for ADS Graphics Client.
**
** Created by Wei Yongming, 2000/08/24
**
** After some hard work, this engine now runs well.
*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "common.h"

#ifdef _ADS_IAL

#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/poll.h>
#include <sys/types.h>
#include <sys/stat.h>

#include "ads_internal.h"
#include "ial.h"
#include "ads.h"

static int ts;
static int mousex = 0;
static int mousey = 0;
static POS pos;

/************************  Low Level Input Operations **********************/
/*
 * Mouse operations -- Event
 */
static int mouse_update(void)
{
    return 1;
}

static void mouse_getxy(int* x, int* y)
{
    *x = mousex;
    *y = mousey;
}

static int mouse_getbutton(void)
{
    return pos.b;
}

static int keyboard_update(void)
{
    return 0;
}

static const char * keyboard_getstate(void)
{
    return NULL;
}

static int wait_event (int which, int maxfd, fd_set *in, fd_set *out, fd_set *except,
                struct timeval *timeout)
{
    fd_set rfds;
    int    e;

    if (!in) {
        in = &rfds;
        FD_ZERO (in);
    }

    if (which & IAL_MOUSEEVENT) {
        FD_SET (ts, in);
        if (ts > maxfd) maxfd = ts;
    }

    e = select (maxfd + 1, in, out, except, timeout) ;

    if (e > 0) {
        if (ts >= 0 && FD_ISSET (ts, in))
        {
            FD_CLR (ts, in);
            read (ts, &pos, sizeof (POS));
            if ( pos.x !=-1 && pos.y !=-1) {
                mousex = pos.x;
                mousey = pos.y;
            }
            pos.b = ( pos.b > 0 ? IAL_MOUSE_LEFTBUTTON:0);
            return IAL_MOUSEEVENT;
        }

    } else if (e < 0) {
        return -1;
    }
    return 0;
}

#if 0
static int wait_event (int which, fd_set *in, fd_set *out, fd_set *except,
                struct timeval *timeout)
{
    struct pollfd ufd;
    if ( (which & IAL_MOUSEEVENT) == IAL_MOUSEEVENT)
    {
        ufd.fd     = ts;
        ufd.events = POLLIN;
        if ( poll (&ufd, 1, timeout->tv_usec) > 0)
        {
            read (ts, &pos, sizeof(POS));
            return IAL_MOUSEEVENT;
        }
    }
    return 0;
}
#endif

BOOL InitADSInput (INPUT* input, const char* mdev, const char* mtype)
{
    ts = open ("/dev/ts", O_RDONLY);
    if ( ts < 0 ) {
        fprintf (stderr, "IAL: Can not open touch screen!\n");
        return FALSE;
    }

    input->update_mouse = mouse_update;
    input->get_mouse_xy = mouse_getxy;
    input->set_mouse_xy = NULL;
    input->get_mouse_button = mouse_getbutton;
    input->set_mouse_range = NULL;

    input->update_keyboard = keyboard_update;
    input->get_keyboard_state = keyboard_getstate;
    input->set_leds = NULL;

    input->wait_event = wait_event;
    mousex = 0;
    mousey = 0;
    return TRUE;
}

void TermADSInput (void)
{
    if ( ts >= 0 )
        close(ts);
}

#endif /* _ADS_IAL */

